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Re: Re: Output display of exponential function in Mathematica

• To: mathgroup at smc.vnet.net
• Subject: [mg62700] Re: [mg62686] Re: Output display of exponential function in Mathematica
• From: carlsonkw at comcast.net
• Date: Thu, 1 Dec 2005 00:46:05 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Log[1/E^.5]
-0.5
Log[1/E^-.5] ? .5
True
Refine[1/E^x, 0<x<1]
E^-x
Or if you need to,
Refine[Log[1/E^x], 0<x<1]
-x
Kris
-------------- Original message -------------- 

> On Sun, 27 Nov 2005 08:24:53 +0000 (UTC), Bob Hanlon 
> wrote: 
> 
> >The output that you want is "unstable", i.e., Mathematica automatically 
> >converts it. 
> > 
> 
> Thanks. 
> 
> I have another question if you don't mind. 
> 
> I'm trying to just check and see if I got a whole bunch of 
> even-numbered study exercises right on exponents and natural logs. 
> The answers to the odds are in the book. 
> 
> As an example, LN(1/e^2) equals what? 
> 
> My answer is -1/2. 
> 
> In mathematica, I tried Simplify[LN(1/e^2)] and it just spit the same 
> thing out as the output. I also tried a couple of variations of 
> Solve[LN[1/e^2] = X] with essentially the same result 
> 
> How would you get Mathematica to verify that the answer is -1/2. 
> 
> Thanks a lot.